wa What is function of diesel fuel injection nozzle perkins common rail fuel system system?

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The main purpose of the fuel injection system is to deliver fuel
into the cylinders of an engine.

In order for the engine to effectively make use of this fuel:

Fuel must be injected at the proper time, that is, the injection
timing must be controlled and

The correct amount of fuel must be delivered to meet power
requirement, that is, injection metering must be controlled.

However, it is still not enough to deliver an accurately metered
amount of fuel at the proper time to achieve good combustion.
Additional aspects are critical to ensure proper fuel injection
system performance including:

Fuel atomization—ensuring that fuel atomizes into very small fuel
particles is a primary design objective for diesel fuel injection
systems. Small droplets ensure that all the fuel has a chance to
vaporize and participate in the combustion process. Any remaining
liquid droplets burn very poorly or are exhausted out of the
engine. While modern fuel injection systems are able to produce
fuel atomization characteristics far exceeding what is needed to
ensure complete fuel evaporation during most of the injection
process, some injection system designs may have poor atomization
during some brief but critical periods of the injection phase. The
end of the injection process is one such critical period.